Apple’s Photos Library repair tool detects any discrepancy in the library’s database and repairs the same. Depending on the number and size of your library photos, and the network speed, the process might take some time. For instance, a 150GB photo library may take about 24 hours. So you need to be patient to get it finished. How to select a specific key photo for a People profile. Apple automatically selects a photo as the key image for a person's profile, but you can always pick a better one. Launch the Photos app on your Mac. Click on the People album in the sidebar under Library. Double-click on the profile you want to change the key photo for.

Mac Photos Has Attempted To Repair The Library
How To Fix A Damaged Macos Photos Library
How To Repair Mac Photos Library
Mac Photos Has Attempted To Repair The Library Window

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After summer comes macOS. This long-standing tradition started by Apple is the most exciting moment of the year — seeing your Macs improve and gain new bells and whistles. In 2019, we're welcoming Catalina, the 10.15 version of macOS named after Catalina island in California. Apparently, it's hot.

The operating system boasts a whole lot of new macOS features like Sidecar, iOS apps porting, and major Photos update. To try the features right away, you can install Catalina from the Software Update tab.

However, be prepared for some troubleshooting. The acquaintance with the new macOS doesn't always go smooth — and with macOS 10.15 deeming support for lots of software, many things will not go smooth. We've collected the key macOS Catalina issues you may encounter, along with the ways to fix them.

macOS 10.15 Catalina problems and their fixes

Giving up Catalina is a decision you can choose to make. But before rolling back, ensure you use every bit of advice as to how you can fix the common problems. Sometimes, a quick fix can solve your concerns.

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Problems with macOS Catalina you can solve:

macOS 10.15 Catalina won't install

This is the classic problem that arises with every macOS release: The installation won't start or you face the 'Catalina installation stuck' problem — when it freezes and you see no progress on the install. No matter how many times you start over, you keep getting an error trying to install Catalina.'

How to fix:

Apple recommends to reset SMC. Shut down your Mac, and hold Shift + Ctrl + Option + Power button for about 10 seconds, with your cable plugged in. Click on the power button and wait for your Mac to start up.
Try resetting NVRAM or PRAM. Shut down your Mac, and hold Option + Command + P + R for about 20 seconds. Wait for your computer to restart.
Reinstall from macOS recovery. Hold Option + Command + R to reinstall. Once you see the startup screen, start the installation again.
Some users reported they were prompted to enter administrator password several times to complete the installation. So it might be something for you to try as well.
In most cases, macOS Catalina cannot be installed on Macintosh HD, because it doesn't have enough disk space. If you install Catalina on top of your current operating system, the computer will keep all the files and still need free space for Catalina. So the easiest fix would be to clean up your system with CleanMyMac X before upgrading. All the system junk, app leftovers, and unneeded files will go away in a minute.
Backup your disk and run a clean install. This will wipe away your current system files, leaving space for macOS Catalina — so yes, this option is for the brave. If you use a solid backup solution, you'll keep your data safe, though. Get Backup Pro is a nice way to do it — unlike Apple's Time Machine, the app allows running bootable backups.

Say you've cleared up and backed up your disk. But your Mac still gets stuck at the installation and shows 'not enough space' error, so you can't get out of the cycle. In this case, there's another fix you can try:

Reinstall Mojave. No worries, this won't delete your disk. Reboot your Mac and hold Command + R to enter the Recovery Mode. Click Reinstall macOS.
Restore from your backup. If you have a Time Machine backup, enter the Recovery Mode again and select 'Restore from Time Machine Backup.' Select the backup from the list and restore your files. Check out how to use apple time machine.

Some users also report they tried to reboot into Safe Mode and take the installation from there; the others used a newly created admin user — but most attempts have been unsuccessful.

We must agree that macOS 10.15 is one of the slowest systems in terms of installation. But if you use the hacks described above and have a little patience, you'll be able to get to the 'Catalina installed' point.

Find more information about how to update mac os the right way.

If you can't login after upgrading to Catalina

There's a known problem of failing to login after the installation. Unfortunately, the only way to fix it — at least for now — would be to roll back to Mojave:

Clean up your Mac with CleanMyMac X and backup your data.
Save passwords to ensure you don't lose license keys and settings.
Create a bootable installer of Mojave (after Catalina goes public, you can download Mojave here).
Delete macOS Catalina: Apple menu > Restart > Command + R > Disk Utility > your startup disk > Erase.

One of the things Mac users are particularly excited about is the new Sidecar feature. It comes as a handy solution for those wanting to expand their workspaces. You can either mirror your Mac's screen to iPad or use your iPad's screen as an extension of a Mac.

If the only reason you're here is because you want Sidecar, we have to warn you it might not work with your new macOS. Reddit is full of user reports about the feature unavailable on macOS Catalina. Most likely, this is the issue of compatibility.

How to fix:

Here are the ways to fix Sidecar problems:

Get the new iPadOS 13. Unfortunately, macOS Catalina doesn't work with iPadOS 12. So basically, you have to use the recent operating systems if you want to try Sidecar.
Make sure your Mac is one of the compatible devices. Sidecar works on:
- 2019 Mac Pro
- Late 2018 Mac mini +
- Late 2018 MacBook Air +
- 2017 iMac Pro
- Mid 2016 MacBook Pro +
- Early 2016 MacBook +
- Late 2015 iMac +
Try connecting your iPad with a cable. With Sidecar, you should be able to connect your iPad wirelessly. If this doesn't work, the cable might solve the issue.

Battery drain on macOS Catalina

Many of the previous macOS releases were known for battery life concerns — greedy apps, Safari and Chrome draining battery, or power-saving not working. There has been no major battery drain issues reported by the Catalina users so far.

How to fix:

Just to make sure you don't encounter the problem as well, here are a few precautions:

Check for apps that use significant energy. For a quick insight, check Apple's in-built Activity Monitor. It shows the 'Energy impact' for every application — calculated based on CPU, network usage, and other factors.
Have a solution for battery health monitoring. iStat Menus is a perfect fit if you need detailed analytics on disk activity, CPU usage, battery life, memory load, and much more. The app shows all the data right in your menu bar. Plus, you can customize what's being monitored flexibly.
Use Screen Time to limit the use of apps. This is the brand-new app on macOS Catalina, which helps you live a healthier Mac user life. Set time limits for the use of specific apps or app categories and schedule downtime. The main goal is to track how much time you spend on the computer, but you can also use it to optimize battery life on Mac.

Apps not working on macOS Catalina

In the attempt to speed up your Mac's performance, Apple is killing 32-bit app architecture with the release of Catalina. This means you have to switch to 64-bit, for good. You might see the messages like this when trying to launch an app:

The chances are it's one

Mac Photos Has Attempted To Repair The Library